Improvement in blast-furnace alarm apparatus



y UNITED STATES PATENT OFFICE;

EDWIN DAVIS, OF MILLERTON, NEW YORK.

IMPROV'EMENT IN BLAST/-FURNACE ALARM APPARATUS. i

Specification forming part of Letters Patent No. 139,300, dated May 27,1873; application filed March 29, 1873. i

To all whom it may concern: d

Beit known that I, EDWIN Davis, of Mily lerton, in the county of Duchessand State of New York, have invented a new and useful Improvement inCover and Alarm for Hotj Blast Furnaces, of which the following is aA Yspecification:

v furnace is readyforanothercharge. Theinveny tion consists in theemployment ot' a cover for closing the part of the furnace-top outsideof the air-heating chamber; in the combination of the chain andbalance-weight with the cover of the furnacetop; in the combination ofthe weight, chains, lever, chain, and the spring, hammer, and gong withthe cover and balance-weight; and in an arrangement of mechanism bywhich an alarm may be sounded automatically by the descent of the ore inthe furnace, as hereinafter fully described.

A is the top of the furnace through which i it is i'ed or charged, andthrough which the smoke and gases escape. B is a chamber or oven forheating the air for the blast, the

` iront wall b of which is built directly over the top .A of thefurnace, and has an arch formed in it so that it may not impede theinsertion of the charge. C represents the pipe into which the cold airis introduced; and D is the pipe from which the heated air passes to thefurnace. The pipes C and D are connec'ted by small bent or arched pipesE, through which the air passes so as to be exposed to theheat in smallstreams. The smoke and gases escape from the" top of the chamber B intoiiues F, which iiues may be directly over the chamber B, or at the sideof the flue G'over the top A. H is a cover hinged to the wall b so thatit may beturned vupjout of the Way when charging the furnace. Tue coverH is so formed as to closely cover the part of the top A in front of thewall b',

and thus compel all the smoke and gases to escape through the chamber Band fines F and more eii'ectually heat the'air for the blast.

To the forward edge of the .cover H is attached one end of a chain, I,which passes over guide-pulley J, pivoted in the upper part of the iiueGr, and to its other end is attached i a weight, K, which so nearlybalances the cover H that said cover may be readily raised and lowered.L is a small weight attached to the lower end of the chain M, whichchainH passes up through a hole in the cover H, passes over aguidepulley, N, pivoted in the upper part of the ue G, and its other endis' attached to the weight K, so that as the weight K descends whenraising the cover H the weight L may be drawn upward out of the way whencharging thefurnace. To the `chain M is attached the end of another orbranch chain, O, the other end of which is attached to the end of thelever P that' passes out through and is pivoted in a hole in the wall ofthe ilue G, and to its other or outer end is attached a chain, Q, whichis connected with a spring, R, and the hammer S of a gong, T. 'lheweight L is designed to rest upon the ore in the furnace, and descendswith said ore, straightening out the chains M, O, so as when the ore hasdescended so low thatthe furnace requires another charge the gong willbe sounded to notify the attendant.

Having thus described my invention, I claim as new anddesire to secureby Letters Patent- 1. The cover H in combination `with the furnace-top Ato cover that part of it outside the air-heating chamber, as specified.

2. The combination of the chain I and balance-weight K with the cover Hof the furnace-top A, substantially as herein shown and described. i y i3. The combination of the Weight L, chains M O, lever P, chain Q, andspring, hammer, and gong R, S, T, with the cover H and balance-weight K,substantially as herein shown and described. I d d d 4. The combinationof the weight L, cords, lever, and gong, as and for the purpose specied.

EDWIN DAVIS.

` Witnesses:

T. J. HOUSTON, A. J. COPP. A

